CN109045958A - The equipment for denitrifying flue gas and method of urea and dioxygen water mixed liquid combination SNCR - Google Patents
The equipment for denitrifying flue gas and method of urea and dioxygen water mixed liquid combination SNCR Download PDFInfo
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- CN109045958A CN109045958A CN201810876933.5A CN201810876933A CN109045958A CN 109045958 A CN109045958 A CN 109045958A CN 201810876933 A CN201810876933 A CN 201810876933A CN 109045958 A CN109045958 A CN 109045958A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/106—Peroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
- F23J2217/102—Intercepting solids by filters electrostatic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
Abstract
The present invention discloses the equipment for denitrifying flue gas and method of urea and dioxygen water mixed liquid combination SNCR.This method will carry out preliminary denitration first with SNCR device, then pass sequentially through air preheater, electrostatic precipitator and wet desulfuration tower processing, be re-fed into denitrating tower, flue gas comes into full contact with denitration spray liquid, NOxFirst adsorb by physical absorbent in denitration spray liquid, redox reaction, generation N then occur with urea and hydrogen peroxide etc.2、CO2And H2O, the depth denitration of realization, 90% or more overall efficiency.The method of the present invention can reach 90% or more denitration efficiency, and cost is more cheap, and equipment is simple, easily operated, be not necessarily to reheating, be not necessarily to catalyst, without secondary pollution.
Description
Technical field
The present invention relates to fire coal boiler fume processing techniques more particularly to a kind of urea and dioxygen water mixed liquid to be combined SNCR
Equipment for denitrifying flue gas and method.
Background technique
Steadily improved with the rapid development of our country's economy with living standards of the people, the consumption of China's energy and electric power and
Demand increases year by year.Due to the energy resources feature of China's few gas rich in coal and poor in oil, the supply of China's electric power is sent out with coal-fired firepower
Based on electricity, and in coal-fired process, flue dust, sulfur dioxide (SO are inevitably resulted from2), nitrogen oxides (NOx), oxidation of coal
Object (CO/CO2), the pollutants such as toxic heavy metals and volatile organic matter (VOCs) such as mercury (Hg).Coal contaminants are to China
Atmospheric environment and ecological environment cause extremely serious pollution and destruction, direct or indirect wound is also brought to human health
Evil and influence.Nitrogen oxides is the most important atmosphere pollution after flue dust and sulfur dioxide, is N2O, NO, NO2, NO3, N2O5
Etc. a series of general name of nitrogen oxides.NOxThere is biggish harm to human body and animals and plants, be capable of forming acid rain and acid mist, breaks
Bad ecological environment, moreover it is possible to form photochemical fog in conjunction with volatile organic matter, destroy ozone layer, and cause global warming.Closely
Over 30 years, the total emission volumn of China's nitrogen oxides sharp increases year by year with the growth of fired power generating unit installed capacity,
Far beyond the ability to bear of environment.With getting worse for environmental pollution and being increasingly enhanced for people's environmental consciousness, coal-fired electricity
The NO of factoryxEmission request is also increasingly strict.According to Chinese Ministry of Environmental Protection's fossil-fuel power plant atmospheric pollutant emission standard (GB 13223-2011),
Either existing coal-burning boiler or newly constructed boiler, NOxEmission limit is 100mg/m3, only small part boiler is implementable
200mg/m3Emission limit.NOxEmission control be very distinct issues in China's socio-economic development, and learn
The hot issue of art field common concern.
The control of Ran Ran power plant NOx emission is there are mainly two types of approach, i.e., in combustion process and flue gas post-processing technology.It is burned
Processing technique, which refers to through the condition of the design, change burning that improve burner, in journey reduces NOxDischarge amount.Common burning
In the process processing technique include low latitude gas excess combustion, Researched of Air Staging Combustion Burning Pulverized Coal, fuel-staged combustion, flue gas recirculation, it is deep or light partially
Difference burning etc..Processing technique is generally only capable of reducing the NO of 30-50% or so in these combustion processesxDischarge, it is difficult to meet existing
The increasingly strict discharge standard of row.Therefore, in thermal power plant's Practical Project, it is necessary to flue gas post-processing technology be installed, to reach row
Put standard.Flue gas post-processing technology mainly selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR).SNCR skill
Art is a kind of without catalyst, within the temperature range of 850~1100 DEG C, by amino-containing reducing agent (such as ammonium hydroxide, urea liquid
Deng) spray into furnace, by the NO in flue gasxReduction removing, generates the denitration technology of nitrogen and water.The denitration efficiency of SNCR technology is only
For 50-70%, it tends to be difficult to meet increasingly strict emission request.Selective catalytic reduction (SCR) is the prosperities such as American-European Japan
The denitration technology that country is widely used.SCR technology denitration efficiency is high, stable, the problem is that, the inactivation of catalyst,
Secondary pollution caused by reducing substances (such as ammonium hydroxide etc.) are revealed, higher dust particles are easy in flue gas under high ash deployment scenarios
The problems such as causing abrasion, the blocking of catalyst, operation and investment cost are very expensive.Wet process of FGD WFGD device is current
Widely applied maturation desulfurization technology.After WFGD desulfurization, flue-gas temperature is generally 50-70 DEG C, and the work of selective catalysis SCR
250-350 DEG C is generally as temperature.If arranging again after WFGD device, SCR carries out denitration, needs to reheat flue gas,
Operating cost is significantly increased in force.
Based on this, there is an urgent need to develop a kind of low costs that can make full use of the devices such as coal-burning power plant existing SNCR and WFGD
Efficient gas denitrifying technology.
Summary of the invention
The purpose of the present invention is be difficult to realize low cost and efficient spy simultaneously for current various gas denitrifying technologies
Point provides a kind of equipment for denitrifying flue gas based on urea and dioxygen water mixed liquid combination SNCR, further object of the present invention
It is to provide a kind of method based on the device.
Application implementation of the present invention based on urea and dioxygen water mixed liquid combination SNCR equipment for denitrifying flue gas mainly include
Boiler, air preheater, electrostatic precipitator, wet desulfuration tower, urea storage tank, SNCR injection apparatus, spray denitrating tower, denitration
Liquid holding vessel.
The exhanst gas outlet of boiler is connected by the gas feed of pipeline and air preheater, the gas vent of air preheater
It is connected by the gas feed of pipeline and electrostatic precipitator, the gas vent of electrostatic precipitator passes through pipeline and wet desulfuration tower
The gas vent of gas feed connection, wet desulfuration tower is connect by pipeline with the gas feed for spraying denitrating tower, and denitration is sprayed
The denitration mixture export of tower is connect by pipeline with the denitration mixed liquor feed inlet of denitration liquid holding vessel, and the de- of denitrating tower is sprayed
Nitre liquid import is exported by the denitration liquid of circulating pump and denitration liquid holding vessel and is connected.
The boiler combustion, which generates, contains NOx、SO2, the pollutants such as dust flue gas；Upper end is sprayed equipped with SNCR in boiler
The liquid-inlet of device, SNCR injection apparatus is connected by the first liquid outlet of urea hydrolysis device and urea storage tank, urine
The second liquid outlet of plain holding vessel passes through the first charging aperture of pipeline and denitration liquid holding vessel；The second of denitration liquid holding vessel into
Material mouth, for the supply of the materials such as urea, hydrogen peroxide and physical absorbent.
The denitration liquid of denitration liquid holding vessel output is the mixed liquor of urea, hydrogen peroxide, physical absorbent, wherein urea quality
Concentration is 1-20%, and hydrogen peroxide mass concentration is 0.1-5%, and physical absorbent mass concentration is 0.1-10%, remaining is water；Institute
The physical absorbent stated abundant, high-specific surface area solids not soluble in water for pore structures such as active carbons.
Denitration liquid entrance is equipped with spray equipment in the spray denitrating tower, and spray equipment is located at spray denitrating tower
Above gas feed；It sprays upper end in denitrating tower and is equipped with back-end ductwork, be equipped with demister below back-end ductwork and (be located at spray equipment
Top).It is come into full contact with spray denitration liquid, NOx is by denitration spray liquid adsorbing and removing in flue gas, and flue gas is again through demister after denitration
Demisting is discharged finally by back-end ductwork.
Spraying denitration liquid operating temperature range in denitrating tower is 20-80 DEG C, is advisable with 50-70 DEG C.
It is a further object to provide the denitration method for flue gas based on urea and dioxygen water mixed liquid combination SNCR.
Step (1), the preliminary denitration of SNCR
Containing NOx、SO2, the pollutants such as dust flue gas generated by boiler combustion, at the beginning of flue gas first carries out SNCR at the top of boiler
Denitration is walked, SNCR reducing agent is urea；
Urea is delivered to urea hydrolysis device by urea storage tank, and SNCR injection apparatus in boiler is delivered to after hydrolysis；
SNCR injection apparatus injects urea into boiler upper end, and sufficiently and smoke contacts, preliminary denitration efficiency are 50-70%.
Step (2), SO2, the pollutant removings processing such as dust
After the preliminary denitration of SNCR, flue gas from the exhanst gas outlet of boiler pass sequentially through air preheater, electrostatic precipitator and
Wet desulfuration tower is handled, SO in flue gas2, the pollutants such as dust be removed processing substantially, while flue gas cool-down is to 50-70 DEG C,
It is subsequently sent to spray denitrating tower and carries out depth denitration.
Step (3), depth denitration
In spray denitrating tower, treated that denitration spray liquid that flue gas sprays with spray equipment comes into full contact with for step (2),
NO in flue gasxIt is first adsorbed by the physical absorbent in denitration spray liquid, redox then occurs with urea and hydrogen peroxide etc.
Reaction generates N2、CO2And H2O, the depth denitration of realization, 90% or more overall efficiency, main chemical reactions are as follows: H2O2+2NO→
2HNO2；2HNO2+NH2CONH2→2N2+CO2+3H2O。
Denitration mixed liquor is delivered to denitration liquid holding vessel, denitration mixed liquor in denitration liquid holding vessel tank after step (4), spray
The materials such as urea, hydrogen peroxide and physical absorbent are suitably fed by the first and second feed inlet.After denitration liquid is thoroughly mixed,
Spray denitrating tower spray equipment is delivered to by circulating pump again and carries out circulated sprinkling denitration.
Step (5), flue gas remove NO through spray denitration liquidxAfterwards, then after demister demisting enter back-end ductwork to discharge.
The beneficial effects of the present invention are:
(1) SNCR reducing agent of the present invention and the interior spray denitration liquid of spray denitrating tower are urea, and have urea storage tank
Supply saves cost of equipment so that appliance arrangement reduces occupied area, realizes dual-use material.
(2) the denitration mixed liquor that the present invention uses is to be mixed in a certain ratio group by urea, hydrogen peroxide and physical absorbent
At；In implementation process, the NOx in flue gas is attracted to adsorbent surface, then aoxidizes with reducing agent and oxidant etc.
Reduction reaction and be removed, adsorbent plays the role of intermediary during denitration reaction, without lasting addition, substantially saves
Operating cost.
(3) present invention uses the preliminary denitration (denitration efficiency 50-70%) of SNCR first, then carries out based on urea and hydrogen peroxide
The depth denitration (comprehensive 90% or more denitration efficiency) of mixed liquor spray, can reduce the hydrogen peroxide usage amount of 60-80%, substantially save
About operating cost.
Denitrating flue gas new method provided by the invention based on urea and dioxygen water mixed liquid combination SNCR, can reach 90%
Above synthesis denitration efficiency, and cost is more cheap, is not necessarily to reheating, is not necessarily to catalyst, equipment is simple, and it is easily operated, without two
Secondary pollution.
Detailed description of the invention
Fig. 1 is the equipment for denitrifying flue gas structural schematic diagram based on urea and dioxygen water mixed liquid combination SNCR；
In figure: boiler 1, air preheater 2, electrostatic precipitator 3, wet desulfuration tower 4, urea storage tank 5, hydrolysis of urea dress
6, SNCR injection apparatus 7 is set, denitrating tower 8, denitration liquid holding vessel 9, feed inlet 10, circulating pump 11, spray equipment 12, demisting are sprayed
Device 13, back-end ductwork 14.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
If Fig. 1 shows, it is a kind of based on urea and dioxygen water mixed liquid combination SNCR equipment for denitrifying flue gas have be sequentially connected
Boiler 1, air preheater 2, electrostatic precipitator 3, wet desulfuration tower 4 and the spray denitrating tower 8 connect.It is arranged in 1 upper end of boiler
SNCR device, SNCR reducing agent are urea, are provided by urea storage tank 5, spurt into boiler upper end through urea hydrolysis device 6 and carry out
Denitration.After SNCR denitration, flue gas passes sequentially through air preheater 2, electrostatic precipitator 3 and wet desulfuration tower 4 and handles, and then send
Enter to spray denitrating tower.Spray equipment 12 is disposed in spray denitrating tower.It is come into full contact with spray denitration liquid, NOx is taken off in flue gas
Nitre spray liquid adsorbing and removing, flue gas discharges again through 13 demisting of demister finally by back-end ductwork 14 after denitration.Denitration after spray
Mixed liquor is delivered to denitration liquid holding vessel 9, holding vessel top layout material inlet, for materials such as urea, hydrogen peroxide and adsorbents
Supply.Denitration mixed liquor is transported to spray equipment 12 by circulating pump 11 in holding vessel 9, to realize circulated sprinkling denitration.
Application implementation of the present invention is based on urea and dioxygen water mixed liquid combination SNCR device (Fig. 1) progress denitration mainly includes
Following steps:
1) contain NOx、SO2, the pollutants such as dust flue gas burnt and generate by boiler 1, it is preliminary that SNCR is first carried out at the top of boiler
Denitration, SNCR reducing agent are urea, are provided by urea storage tank 5, spurt into boiler upper end, denitration effect through urea hydrolysis device 6
Rate is 50-70%.
2) after SNCR denitration, flue gas passes sequentially through air preheater 2, electrostatic precipitator 3 and wet desulfuration tower 4 and handles,
SO2, the pollutants such as dust be removed processing substantially, flue gas is also cooled to 50-70 DEG C, is subsequently sent to spray denitrating tower 8 and carries out
Depth denitration.
3) the denitration spray liquid that flue gas is sprayed with spray equipment 12 comes into full contact with, the NO in flue gasxFirst by denitration spray liquid
In adsorbent absorption, redox reaction then occurs with urea and hydrogen peroxide etc., generates N2、CO2And H2O realizes that depth is de-
Nitre, 90% or more overall efficiency, main chemical reactions are as follows: H2O2+2NO→2HNO2；2HNO2+NH2CONH2→2N2+CO2+3H2O。
4) denitration mixed liquor is delivered to denitration liquid holding vessel 9 after spraying, and denitration mixed liquor is appropriate by material inlet 10 in tank
The materials such as urea, hydrogen peroxide and physical absorbent are fed, wherein urea is supplied by urea storage tank 5.Denitration liquid is sufficiently stirred mixed
After conjunction, then spray equipment 12 is delivered to by circulating pump 11 and carries out circulated sprinkling denitration.
5) NO is removed through spray denitration liquidxAfterwards, flue gas enters back-end ductwork 14 again after 13 demisting of demister and discharges.
It is improved as a kind of innovation, same reducing agent, i.e. urea are selected in SNCR and spray denitration, same by urea storage tank
When supply, not only reduce occupied area, but also save cost of equipment, realize dual-use material.
Above-mentioned denitration mixed liquor is made of the mixing in proportion of urea, hydrogen peroxide and physical absorbent, wherein urea matter
Amount concentration is 1-20%, and hydrogen peroxide mass concentration is 0.1-5%, and adsorbent mass concentration is 0.1-10%, denitration mixed liquor work
Making temperature range is 20-80 DEG C, is advisable with 50-70 DEG C.
The present invention carries out preliminary denitration (denitration efficiency 50-70%) with SNCR, then mixed based on urea and hydrogen peroxide
The depth denitration (comprehensive 95% or more denitration efficiency) of liquid spray, can reduce the hydrogen peroxide usage amount of 60-80%, substantially save de-
Nitre cost.
It is bis- with 0.3-0.5% using 0.5-1% active carbon as adsorbent using 10% urea as reducing agent according to experimental result
Oxygen water is oxidant, spray process and 90% or more Bubbling method denitration efficiency.
The above enumerated are only specific embodiments of the present invention for finally, it should also be noted that.Obviously, the present invention is unlimited
In above embodiments, the cigarette based on urea and hydrogen peroxide combination SNCR can also be such as realized using Bubbling method there are many deforming
Qi exhaustion nitre.
The present invention can be summarized with others without prejudice to the concrete form of spirit or central characteristics of the invention.Therefore, nothing
By from the point of view of which point, the embodiment above of the invention can only all be considered the description of the invention and cannot limit this hair
Bright, claims indicate the scope of the present invention, and above-mentioned explanation does not point out the scope of the present invention, therefore, with this
Any change in the comparable meaning and scope of claims of invention is all considered as including the range in claims
It is interior.
Claims (4)
1. the equipment for denitrifying flue gas of urea and dioxygen water mixed liquid combination SNCR, it is characterised in that mainly pre- including boiler, air
Hot device, electrostatic precipitator, wet desulfuration tower, urea storage tank, SNCR injection apparatus, spray denitrating tower, denitration liquid holding vessel；
The exhanst gas outlet of boiler is connected by the gas feed of pipeline and air preheater, and the gas vent of air preheater passes through
The gas feed of pipeline and electrostatic precipitator connects, and the gas vent of electrostatic precipitator passes through the gas of pipeline and wet desulfuration tower
The gas vent of import connection, wet desulfuration tower is connect by pipeline with the gas feed for spraying denitrating tower, and denitrating tower is sprayed
Denitration mixture export is connect by pipeline with the denitration mixed liquor feed inlet of denitration liquid holding vessel, and the denitration liquid of denitrating tower is sprayed
Import is exported by the denitration liquid of circulating pump and denitration liquid holding vessel and is connected；
The boiler combustion, which generates, contains NOx、SO2, the pollutants such as dust flue gas；Upper end is equipped with SNCR injection apparatus in boiler,
The liquid-inlet of SNCR injection apparatus is connected by the first liquid outlet of urea hydrolysis device and urea storage tank, urea storage
The second liquid outlet of tank passes through the first charging aperture of pipeline and denitration liquid holding vessel；The second charging aperture of denitration liquid holding vessel,
It is supplied for materials such as urea, hydrogen peroxide and physical absorbents；
The denitration liquid of denitration liquid holding vessel output is the mixed liquor of urea, hydrogen peroxide, physical absorbent, wherein urea quality concentration
For 1-20%, hydrogen peroxide mass concentration is 0.1-5%, and physical absorbent mass concentration is 0.1-10%, remaining is water；
Denitration liquid entrance is equipped with spray equipment in the spray denitrating tower, and spray equipment is located at the gas of spray denitrating tower
Above import；The top of spray equipment is equipped with demister；It sprays upper end in denitrating tower and is located at the top of demister equipped with tail portion
Flue；
Spraying denitration liquid operating temperature range in denitrating tower is 20-80 DEG C.
2. the equipment for denitrifying flue gas of urea as described in claim 1 and dioxygen water mixed liquid combination SNCR, it is characterised in that institute
The physical absorbent stated abundant, high-specific surface area solids not soluble in water for pore structures such as active carbons.
3. the equipment for denitrifying flue gas of urea as described in claim 1 and dioxygen water mixed liquid combination SNCR, it is characterised in that spray
Drenching denitration liquid operating temperature range in denitrating tower is 50-70 DEG C.
4. the denitration method for flue gas based on urea and dioxygen water mixed liquid combination SNCR, it is characterised in that this method is specific as follows:
Step (1), the preliminary denitration of SNCR
Containing NOx、SO2, the pollutants such as dust flue gas generated by boiler combustion, it is tentatively de- that flue gas first carries out SNCR at the top of boiler
Nitre, SNCR reducing agent are urea；
Urea is delivered to urea hydrolysis device by urea storage tank, and SNCR injection apparatus in boiler is delivered to after hydrolysis；SNCR spray
Injection device injects urea into boiler upper end, and sufficiently and smoke contacts, preliminary denitration efficiency are 50-70%；
Step (2), SO2, the pollutant removings processing such as dust
After the preliminary denitration of SNCR, flue gas passes sequentially through air preheater, electrostatic precipitator and wet process from the exhanst gas outlet of boiler
Desulfurizing tower is handled, SO in flue gas2, the pollutants such as dust be removed processing substantially, while flue gas cool-down is to 50-70 DEG C, then
It is sent into spray denitrating tower and carries out depth denitration；
Step (3), depth denitration
In spray denitrating tower, treated that denitration spray liquid that flue gas sprays with spray equipment comes into full contact with for step (2), flue gas
In NOxIt is first adsorbed by the physical absorbent in denitration spray liquid, redox reaction then occurs with urea and hydrogen peroxide etc.,
Generate N2、CO2And H2O, the depth denitration of realization, 90% or more overall efficiency, main chemical reactions are as follows: H2O2+2NO→2HNO2；
2HNO2+NH2CONH2→2N2+CO2+3H2O；
Denitration mixed liquor is delivered to denitration liquid holding vessel after step (4), spray, and denitration mixed liquor passes through in denitration liquid holding vessel tank
First and second feed inlet adds the materials such as urea, hydrogen peroxide and physical absorbent；After denitration liquid is thoroughly mixed, then by following
Ring pump is delivered to spray denitrating tower spray equipment and carries out circulated sprinkling denitration；
Step (5), flue gas remove NO through spray denitration liquidxAfterwards, then after demister demisting enter back-end ductwork to discharge.
Priority Applications (1)
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